Do Willie Wagtails Delay the Lay?

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Woko
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Do Willie Wagtails Delay the Lay?

About 10 days ago Ms Woko & I observed a couple of Willie Wagtails building a nest near our house. They beavered (or should that be Williewagtailed?) away for about 4 days then abandoned what seemed to be a completed nest. At the time we occasionally sighted or heard a Grey Currawong which stimulated quite a few alarm calls among the resident birdlife. Now, 3 days since a Grey Currawong has been sighted or heard, a Willie Wagtail is sitting on the nest. So I’m wondering if Willie Wagtails have the capacity to delay egg production until conditions are favorable. Has anyone else noticed such an event?

Woko
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I strongly suspect that the young Willie Wagtails have left the eggs because whenever I checked the nest today I found the parent bird standing over the nest as if it was shading it in the 35 degrees heat. 

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